Of course, this was an expected move.
While it was at it, BMW has also made the system available on the
fixed-roof 6 Series coupe as well. xDrive is a new feature for the 650i,
joining a larger segment that includes a wider variety of challengers
including the Cadillac CTS, Infiniti G37 and BMW's own 3 Series, which offers xDrive as an option on sedan, wagon and coupe models, albeit not on convertibles.